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Improving Environmental Microplastic Extrapolation: From Field of View to Full Sample, and from Microplastic 2D‐Morphology to Mass
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Measuring microplastics in environmental samples using microscopy is time-consuming, so researchers typically examine only a small portion of each sample and extrapolate — but current methods introduce errors of 50–80%. This study introduces a more reliable area-based extrapolation technique and a simplified formula for estimating the mass of microplastic particles from their two-dimensional shapes under a microscope. These methodological advances are important because without accurate and standardized measurement methods, it is difficult to compare microplastic pollution levels across different studies or track changes over time.
Microplastic (MP) analysis via microspectroscopy typically examines only 1-10% of filter substrates due to time constraints, requiring reliable extrapolation methods for quantitative environmental monitoring. Current subsampling strategies suffer from heterogeneous particle dispersion, leading to 50-80% error in MP quantification. Additionally, MP researchers require enhanced environmental MP mass datasets, necessitating reliable conversion algorithms from two-dimensional morphological data to mass estimates. This study introduces an area-based extrapolation technique that compares the MP-to-generic particle area ratio within a rectangular field of view against total particle area on the entire filter membrane, combined with a simplified morphology-to-mass conversion model (Hagelskjær model). First, two Sphagnum moss samples were analyzed using Raman microspectroscopy and critical angle darkfield illumination microscopy. Results demonstrated stable MP concentrations (17% RSD [n = 8]) despite heterogeneous generic particle distribution (31% RSD [n = 8]), with mean particle-area coverage of 2.4% per subsample. Then, twenty MP fragment subsamples (10 µm to 1500 µm) were used to calibrate the height multiplier (Mh) which ranged from 0.26 to 0.47 (mean: 0.34 ± 0.05, 15% RSD), establishing that particle height equals approximately one-third of the minimum Feret diameter with this simplified plane-particle model. These methods enable MP quantification and mass estimation from limited spectroscopic analysis.
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